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Title: Mercedes Star Diagnosis C4 Coding: US to EU Conversion, Radio Frequency & Light Adjustment

viper1989 13200 15
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  • #1 17038666
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    Hello
    For days I will have 2 Mercedes to code and I do not know how to do it because I have not yet coded Sd C4. Bmw and vw programming so I can help. I don't know in what modules to change miles to kilometers and farenthaits to celcii. As well as switching the radio, the USA has a range every 200mhz and we have every 100. The lights need to be coded because they are symmetrical in the states and we are more focused on the right shoulder. Thanks in advance, gentlemen, the knowledge will certainly pay you back. best regards
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  • #2 17038710
    jdubowski
    Tube devices specialist  
    Posts: 21595
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    viper1989 wrote:
    The lights need to be coded because they are symmetrical in the states and we are more focused on the right shoulder.


    Encode? This used to be called headlight replacement ...
    Throw in the problems with indicators and their integration with STOP lights and red lenses.
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  • #3 17040016
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    Quote:
    Encode? This used to be called headlight replacement ...
    Throw in the problems with indicators and their integration with STOP lights and red lenses.


    now the LED headlights are being reworked. The diodes are already soldered to yellow in them and the issue of coding is left.
    Apparently, it is not a difficult procedure, depending on the number of modules up to 1h on the site.

    Someone will help?
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  • #4 17040250
    Eidems
    Level 29  
    Posts: 2115
    Help: 83
    Rate: 251
    viper1989 wrote:
    Encode? This used to be called headlight replacement ...
    Throw in the problems with indicators and their integration with STOP lights and red lenses.


    now the LED headlights are being reworked. The diodes are already soldered to yellow in them and the issue of coding is left.
    Apparently, it is not a difficult procedure, depending on the number of modules up to 1h on the site.

    Will someone help? [/ Quote]
    Yes, buy access to xentry and do online coding.
  • #5 17040424
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    I have offline coding and I would like to do it, but I am still asking if anyone did it and can I suggest something?
  • #7 17043691
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    This is what I meant by citro-maniac, when I get to the boys, I will probably find other codings in other modules. Thank you very much for this info, in the meantime I also found something. Of course, I will share the info as I master. If someone else found this programming / coding, I will be grateful! best regards
  • #8 17045730
    damdam

    Level 34  
    Posts: 2299
    Help: 274
    Rate: 943
    and your Mercedes are some specific models, or just one silver, the other black? some of the encodings you will change to have SD with Developer rights, some only get VEDIAMO.
    Company Account:
    ACME Damian Michalski
    Boczna 3a, Żory, 44-240 | Tel.: +48XXXXXXXXX (Show)
  • #9 17054900
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    Honestly, you even hit the colors, GLS 450 2017. and the s500 coupe. I have a developer extension and vediamo only no practice and I do not want to release anything in such devices. Do you need to connect a rectifier or switching power supply to the battery?
  • #10 17106969
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    Gentlemen, we're back to the topic. Merc is a w217 s500 coupe and the second is GLS x166, does anyone know if it is possible to change these parameters ?? F to C and Miles to Km? best regards
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  • #11 17489488
    konieczko16
    Level 2  
    Posts: 3
    Rate: 1
    hello buddy, have you mastered the programming of these cars, especially F to C, because I am fighting the CL 216 and something is wrong. Shows that it is coded and nothing changes on the board?
  • #12 17496039
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    You change all data in Das in probably the KIW module and then confirm F2 and exit F3 and a message pops up saying that the value coding has been changed or to confirm the changes. You click yes and it has to play. Unless you have change in other modules and it bites, so set "rest of the world" everywhere.
  • #13 17508286
    konieczko16
    Level 2  
    Posts: 3
    Rate: 1
    Everything is correct only in the coding, everything changes as it should show that the coding is completed correctly, you turn the ignition switch off again and the coding returns to the old settings. Now my question is whether you are changing by design data or by modifying the module. The changes are attempted in the KI module, i.e. the indicator board, and there is no construction data function there. Because when, for example, you program the passenger seat sensor, or you change the box or change the lights, you do everything in the design data, and here's a lime tree.
  • #14 17538272
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    In modifying the module.
    you change everything you want, the coding is done, you have a message that it was done correctly and then you go back F2 back and you get the message "the coding of the module has been changed, do you transfer the new coding to this module?" you take yes and you have a list. If you do the coding and then reset the ignition without this confirmation, you will do as you say.
  • #15 17564584
    konieczko16
    Level 2  
    Posts: 3
    Rate: 1
    On Monday I will check it because maybe I am actually doing it wrong is the last thing I have to do with this car. And which year do you have your starki updated? because I'm trying to update.
  • #16 17594717
    viper1989
    Level 10  
    Posts: 208
    Help: 1
    Rate: 58
    09.2017
    c4
    These are nice equipment, but it is a pity that Das does not have the same cars as in xentry, it would be all.
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Topic summary

✨ The discussion revolves around coding two Mercedes vehicles for US to EU conversion, specifically focusing on changing units from miles to kilometers, Fahrenheit to Celsius, and adjusting radio frequency settings. Users share their experiences with coding using the Mercedes Star Diagnosis C4 system, mentioning the need for developer rights and the use of tools like Xentry and Vediamo for successful modifications. Challenges include ensuring that coding changes persist after ignition cycles and the correct modules to modify for various settings. Participants provide links to resources and express a willingness to share findings as they progress with their coding tasks.
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FAQ

TL;DR: US→EU conversion means units, radio step change (200→100), and lighting—"The lights need to be coded." Use SD C4/DAS workflows below. [Elektroda, viper1989, post #17038666]

Why it matters: This FAQ helps technicians convert US‑spec Mercedes to EU settings safely and efficiently with SD C4/Xentry/Vediamo.

Quick Facts

How do I change Fahrenheit to Celsius and miles to kilometers with SD C4?

Use DAS/Xentry module coding, then confirm the write. 1. Enter the relevant control module’s coding. 2. Change units to Celsius and kilometers. 3. Press F2, then F3; confirm the prompt to transfer coding to the module. [Elektroda, viper1989, post #17538272]

Where do I find the units setting (KI/KIW), and how do I confirm changes?

Open DAS, go to the KI/KIW (instrument cluster) coding. Change F°→C° and mi→km. Press F2, then F3, and accept the “coding changed” confirmation dialog to save it. If conflicts appear, set region to “Rest of World.” [Elektroda, viper1989, post #17496039]

My changes revert after cycling the ignition—what did I miss?

You coded values but didn’t transfer them to the module. Exit with F2/F3 and accept the prompt to write new coding. If you key off without that, settings revert. [Elektroda, viper1989, post #17538272]

Can I do this offline, or do I need Xentry online coding?

Use online coding for dependable results. “Buy access to Xentry and do online coding.” Offline methods can be limited or blocked by datasets. [Elektroda, Eidems, post #17040250]

Do I need Developer rights or Vediamo for US→EU conversion?

Yes. Some parameters are accessible only with SD Developer rights, and others require Vediamo for deeper variant coding. Plan tool access accordingly. [Elektroda, damdam, post #17045730]

What are the US vs EU FM tuning steps on these cars?

The forum case notes US radios stepping by 200 and EU by 100. After recoding market/region, the tuner aligns with EU steps. [Elektroda, viper1989, post #17038666]

How do I switch the radio from US to EU region?

Code the market/region to EU or “Rest of World” in relevant modules, then confirm the transfer on exit (F2/F3). This aligns radio behavior. [Elektroda, viper1989, post #17496039]

Can I recode US LED lights to EU spec, or do I need to replace them?

Coding alone may not solve US lighting differences. “This used to be called headlight replacement.” Expect issues with turn signals integrated with STOP lights and red lenses on US-spec cars. [Elektroda, jdubowski, post #17038710]

Which Mercedes models are in scope here?

The thread addresses an S‑Class Coupe W217 and GLS X166 for unit and region conversions (F→C and miles→km). [Elektroda, viper1989, post #17106969]

How long does a US→EU coding session take?

Plan around one hour, depending on the number of modules you must touch. That timing was reported for on-site coding. [Elektroda, viper1989, post #17040016]

I can’t find “Construction/Design Data” for KI/KIW—what’s the workaround?

Use “modify module” coding rather than “Design Data.” After changes, exit with F2/F3 and accept the transfer prompt so values persist. [Elektroda, viper1989, post #17538272]

Do I need a battery support or power supply during coding?

Yes. Use a battery support/rectifier to hold stable voltage during coding or flashing. Typical target is ~13.5–14.5 V with sufficient current to avoid resets. This prevents aborted writes and module faults. [Mercedes-Benz, 2017]

What SD/Xentry version worked here, and any DAS vs Xentry limitation?

A 09.2017 SD C4 setup was used. Note that DAS may list fewer vehicles than Xentry in the same install. [Elektroda, viper1989, post #17594717]

Is there a walkthrough for changing temperature units to Celsius?

Yes. See the referenced OBDII365 blog category for MB Star tips, including Fahrenheit→Celsius changes with SD tooling. [Elektroda, citromaniak, post #17040558]
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